Spool for magnet coils



Aug. 18, 1925.

J. J! VIENNEAU SPOOL FOR MAGNET coIL's Filed Feb, 13 924 Inventor Jacob J- Vieywneau';

His Atmornel Patented Aug. 1% i925.

moon 3'. VIENNEAU, orrrrrsrrntn, aressecrrosnrrs, assreiton ro GENERAL annornrc COMPANY, A conroaarron or roan.

SPOOL FOR MAGNET (SOILS,

To all whom it may concern:

Be it known that I, JAooB J. VIENNEAU, a citizen of the United States, residing at Pit-tsfield, in the county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Spools for Magnet Coils, of which the following is a specification.

My invention relates to spools for magnet coils and has for its object the provision of means for holding the turns of the first layer in place when the turns of subsequent layers are wound on.

In the winding of magnet coils where layer insulation is omitted there is a tendency for the turns of the first layer to be spread apart by the turns of the second layer so that the turns of the second layer sink in between the turns of the first layer. This is particularly true where round conductors are being wound and where the turns of each subsequent layer are wound in the gutters or channels between the turns of the next preceding layer. Obviously when this occurs the turns of the second layer are uneven, with the result that sub sequent layers wound on the second layer are also uneven, so that an irregular coil .is produced.

In carrying out my invention I provide a roughened surface on which the turns of the first layer are wound and whereby they are secured in place.

For more complete understanding of my invention reference should be had to the accompanying drawing, the single figure of which shows a fragmentary sectional view of a magnet coil wound in accordance with my invention.

Referring to the drawing, in one form of my invention 1 apply a layer 10 of sandpaper on the winding surface 11 of the spool 12. This layer of sandpaper 10 completely covers the winding surface 11 and is applied with its roughened abrasive surface outermost so as to engage and hold securely in place against lateral movement the turns 13 of the first layer of the coil. It will, be understood that after the sheet, of sandpaper is applied the turns of the electric conductor are wound on in successive layers in the usual manner. The con ductor is suitably insulated, as by coating of cotton, enamel or other insulating material.

The turns 18 of the first layer are thus securely held due to their engagement with the abrasive surface of the sandpaper 10 so that they cannot be spread apart by the turns 1% of the second layer. This tendency to spread apart the turns of the first layer is particularly pronounced where the turns of the second layer are wound in the gutters or channels between the turns of the first layer. Thus the second turn 15 of the second layer has a great tendency to wedge apart and sink in between the last two turns 16 and 17 of the first layer, since the last turn 17 often does not lie in engagement with the adjacent flange of the spool. In this particular form of coil, a space 18 is left between the flange of the spool and the last turn 17 of the firstlayer, which space is approximately equal to one-half the diameter of the conductor and is provided to form a channel or space in which the first turn 19 of the second layer is wound. Obviously any suitable abrasive surface may be provided on the spool. For example, the winding surface of the spool itself may be roughened.

While I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto, since various modifica-tions thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

Nhat I claim as new and desire to secure by Letters Patent of the United States is:

1. A spool for magnet coils provided with a roughened surface on which the first layer of the coil is wound, said roughened surface being arranged to secure the turns of the first layer closely adjacent each other irrespective of the size of wire from which the coil is being wound.

2. A spool for magnet coils provided with an abrasive surface on which the turns of the first layer of the coil are wound, whereby said turns are secured in place while the turns of the next layer are being wound on.

3. The combination with a spool for magnet coils, of a layer of abrasive material covering the winding surface of said spool on which the turns of the first layer are wound whereby said turns are secured in place when the turns of the next layer are wound on.

4. The combination with a spool for magnet coils, of a layer of sandpaper applied to the winding surface of said spool upon which the turns of the first layer of the coil are wound and by means of which said turns are held in place when the turns 1 of the subsequent layers are woimd on.

In witness whereof I have hereunto set my hand this 11th day of F ch, 1924:.

JACOB J. VIENNEAU. 

